<?php  if ( ! defined('BASEPATH')) exit('No direct script access allowed');
/**
 * 扩展文本辅助函数
 */

// ------------------------------------------------------------------------

/**
 * Word Limiter
 *
 * Limits a string to X number of words.
 *
 * @access	public
 * @param	string
 * @param	integer
 * @param	string	the end character. Usually an ellipsis
 * @return	string
 */
if ( ! function_exists('word_limiter'))
{
	function word_limiter($str, $limit = 100, $end_char = '&#8230;')
	{
		if (trim($str) == '')
		{
			return $str;
		}

		//preg_match('/^\s*+(?:\S++\s*+){1,'.(int) $limit.'}/', $str, $matches);
        preg_match('/^.{1,'.(int) $limit.'}/u', $str, $matches);

		if (strlen($str) == strlen($matches[0]))
		{
			$end_char = '';
		}

		return rtrim($matches[0]).$end_char;
	}
}

// ------------------------------------------------------------------------

/**
 * Character Limiter
 *
 * Limits the string based on the character count.  Preserves complete words
 * so the character count may not be exactly as specified.
 *
 * @access	public
 * @param	string
 * @param	integer
 * @param	string	the end character. Usually an ellipsis
 * @return	string
 */
if ( ! function_exists('character_limiter'))
{
    function character_limiter($str, $n = 500, $end_char = '&#8230;')
    {
        if (strlen($str) < $n)
        {
            return $str;
        }

        $str = preg_replace("/\s+/", ' ', str_replace(array("\r\n", "\r", "\n"), ' ', $str));

        if (strlen($str) <= $n)
        {
            return $str;
        }

        $out = "";
        foreach (explode(' ', trim($str)) as $val)
        {
            $out .= $val.' ';

            if (strlen($out) >= $n)
            {
                $out = trim($out);
                return (strlen($out) == strlen($str)) ? $out : $out.$end_char;
            }
        }
    }
}

// ------------------------------------------------------------------------

/**
 * High ASCII to Entities
 *
 * Converts High ascii text and MS Word special characters to character entities
 *
 * @access	public
 * @param	string
 * @return	string
 */
if ( ! function_exists('ascii_to_entities'))
{
    function ascii_to_entities($str)
    {
        $count	= 1;
        $out	= '';
        $temp	= array();

        for ($i = 0, $s = strlen($str); $i < $s; $i++)
        {
            $ordinal = ord($str[$i]);

            if ($ordinal < 128)
            {
                /*
                    If the $temp array has a value but we have moved on, then it seems only
                    fair that we output that entity and restart $temp before continuing. -Paul
                */
                if (count($temp) == 1)
                {
                    $out  .= '&#'.array_shift($temp).';';
                    $count = 1;
                }

                $out .= $str[$i];
            }
            else
            {
                if (count($temp) == 0)
                {
                    $count = ($ordinal < 224) ? 2 : 3;
                }

                $temp[] = $ordinal;

                if (count($temp) == $count)
                {
                    $number = ($count == 3) ? (($temp['0'] % 16) * 4096) + (($temp['1'] % 64) * 64) + ($temp['2'] % 64) : (($temp['0'] % 32) * 64) + ($temp['1'] % 64);

                    $out .= '&#'.$number.';';
                    $count = 1;
                    $temp = array();
                }
            }
        }

        return $out;
    }
}

// ------------------------------------------------------------------------

/**
 * Entities to ASCII
 *
 * Converts character entities back to ASCII
 *
 * @access	public
 * @param	string
 * @param	bool
 * @return	string
 */
if ( ! function_exists('entities_to_ascii'))
{
    function entities_to_ascii($str, $all = TRUE)
    {
        if (preg_match_all('/\&#(\d+)\;/', $str, $matches))
        {
            for ($i = 0, $s = count($matches['0']); $i < $s; $i++)
            {
                $digits = $matches['1'][$i];

                $out = '';

                if ($digits < 128)
                {
                    $out .= chr($digits);

                }
                elseif ($digits < 2048)
                {
                    $out .= chr(192 + (($digits - ($digits % 64)) / 64));
                    $out .= chr(128 + ($digits % 64));
                }
                else
                {
                    $out .= chr(224 + (($digits - ($digits % 4096)) / 4096));
                    $out .= chr(128 + ((($digits % 4096) - ($digits % 64)) / 64));
                    $out .= chr(128 + ($digits % 64));
                }

                $str = str_replace($matches['0'][$i], $out, $str);
            }
        }

        if ($all)
        {
            $str = str_replace(array("&amp;", "&lt;", "&gt;", "&quot;", "&apos;", "&#45;"),
                array("&","<",">","\"", "'", "-"),
                $str);
        }

        return $str;
    }
}

// ------------------------------------------------------------------------

/**
 * Word Censoring Function
 *
 * Supply a string and an array of disallowed words and any
 * matched words will be converted to #### or to the replacement
 * word you've submitted.
 *
 * @access	public
 * @param	string	the text string
 * @param	string	the array of censoered words
 * @param	string	the optional replacement value
 * @return	string
 */
if ( ! function_exists('word_censor'))
{
    function word_censor($str, $censored, $replacement = '')
    {
        if ( ! is_array($censored))
        {
            return $str;
        }

        $str = ' '.$str.' ';

        // \w, \b and a few others do not match on a unicode character
        // set for performance reasons. As a result words like über
        // will not match on a word boundary. Instead, we'll assume that
        // a bad word will be bookeneded by any of these characters.
        $delim = '[-_\'\"`(){}<>\[\]|!?@#%&,.:;^~*+=\/ 0-9\n\r\t]';

        foreach ($censored as $badword)
        {
            if ($replacement != '')
            {
                $str = preg_replace("/({$delim})(".str_replace('\*', '\w*?', preg_quote($badword, '/')).")({$delim})/i", "\\1{$replacement}\\3", $str);
            }
            else
            {
                $str = preg_replace("/({$delim})(".str_replace('\*', '\w*?', preg_quote($badword, '/')).")({$delim})/ie", "'\\1'.str_repeat('#', strlen('\\2')).'\\3'", $str);
            }
        }

        return trim($str);
    }
}

// ------------------------------------------------------------------------

/**
 * Code Highlighter
 *
 * Colorizes code strings
 *
 * @access	public
 * @param	string	the text string
 * @return	string
 */
if ( ! function_exists('highlight_code'))
{
    function highlight_code($str)
    {
        // The highlight string function encodes and highlights
        // brackets so we need them to start raw
        $str = str_replace(array('&lt;', '&gt;'), array('<', '>'), $str);

        // Replace any existing PHP tags to temporary markers so they don't accidentally
        // break the string out of PHP, and thus, thwart the highlighting.

        $str = str_replace(array('<?', '?>', '<%', '%>', '\\', '</script>'),
            array('phptagopen', 'phptagclose', 'asptagopen', 'asptagclose', 'backslashtmp', 'scriptclose'), $str);

        // The highlight_string function requires that the text be surrounded
        // by PHP tags, which we will remove later
        $str = '<?php '.$str.' ?>'; // <?

        // All the magic happens here, baby!
        $str = highlight_string($str, TRUE);

        // Prior to PHP 5, the highligh function used icky <font> tags
        // so we'll replace them with <span> tags.

        if (abs(PHP_VERSION) < 5)
        {
            $str = str_replace(array('<font ', '</font>'), array('<span ', '</span>'), $str);
            $str = preg_replace('#color="(.*?)"#', 'style="color: \\1"', $str);
        }

        // Remove our artificially added PHP, and the syntax highlighting that came with it
        $str = preg_replace('/<span style="color: #([A-Z0-9]+)">&lt;\?php(&nbsp;| )/i', '<span style="color: #$1">', $str);
        $str = preg_replace('/(<span style="color: #[A-Z0-9]+">.*?)\?&gt;<\/span>\n<\/span>\n<\/code>/is', "$1</span>\n</span>\n</code>", $str);
        $str = preg_replace('/<span style="color: #[A-Z0-9]+"\><\/span>/i', '', $str);

        // Replace our markers back to PHP tags.
        $str = str_replace(array('phptagopen', 'phptagclose', 'asptagopen', 'asptagclose', 'backslashtmp', 'scriptclose'),
            array('&lt;?', '?&gt;', '&lt;%', '%&gt;', '\\', '&lt;/script&gt;'), $str);

        return $str;
    }
}

// ------------------------------------------------------------------------

/**
 * Phrase Highlighter
 *
 * Highlights a phrase within a text string
 *
 * @access	public
 * @param	string	the text string
 * @param	string	the phrase you'd like to highlight
 * @param	string	the openging tag to precede the phrase with
 * @param	string	the closing tag to end the phrase with
 * @return	string
 */
if ( ! function_exists('highlight_phrase'))
{
    function highlight_phrase($str, $phrase, $tag_open = '<strong>', $tag_close = '</strong>')
    {
        if ($str == '')
        {
            return '';
        }

        if ($phrase != '')
        {
            return preg_replace('/('.preg_quote($phrase, '/').')/i', $tag_open."\\1".$tag_close, $str);
        }

        return $str;
    }
}

// ------------------------------------------------------------------------

/**
 * Convert Accented Foreign Characters to ASCII
 *
 * @access	public
 * @param	string	the text string
 * @return	string
 */
if ( ! function_exists('convert_accented_characters'))
{
    function convert_accented_characters($str)
    {
        if (defined('ENVIRONMENT') AND is_file(APPPATH.'config/'.ENVIRONMENT.'/foreign_chars.php'))
        {
            include(APPPATH.'config/'.ENVIRONMENT.'/foreign_chars.php');
        }
        elseif (is_file(APPPATH.'config/foreign_chars.php'))
        {
            include(APPPATH.'config/foreign_chars.php');
        }

        if ( ! isset($foreign_characters))
        {
            return $str;
        }

        return preg_replace(array_keys($foreign_characters), array_values($foreign_characters), $str);
    }
}

// ------------------------------------------------------------------------

/**
 * Word Wrap
 *
 * Wraps text at the specified character.  Maintains the integrity of words.
 * Anything placed between {unwrap}{/unwrap} will not be word wrapped, nor
 * will URLs.
 *
 * @access	public
 * @param	string	the text string
 * @param	integer	the number of characters to wrap at
 * @return	string
 */
if ( ! function_exists('word_wrap'))
{
    function word_wrap($str, $charlim = '76')
    {
        // Se the character limit
        if ( ! is_numeric($charlim))
            $charlim = 76;

        // Reduce multiple spaces
        $str = preg_replace("| +|", " ", $str);

        // Standardize newlines
        if (strpos($str, "\r") !== FALSE)
        {
            $str = str_replace(array("\r\n", "\r"), "\n", $str);
        }

        // If the current word is surrounded by {unwrap} tags we'll
        // strip the entire chunk and replace it with a marker.
        $unwrap = array();
        if (preg_match_all("|(\{unwrap\}.+?\{/unwrap\})|s", $str, $matches))
        {
            for ($i = 0; $i < count($matches['0']); $i++)
            {
                $unwrap[] = $matches['1'][$i];
                $str = str_replace($matches['1'][$i], "{{unwrapped".$i."}}", $str);
            }
        }

        // Use PHP's native function to do the initial wordwrap.
        // We set the cut flag to FALSE so that any individual words that are
        // too long get left alone.  In the next step we'll deal with them.
        $str = wordwrap($str, $charlim, "\n", FALSE);

        // Split the string into individual lines of text and cycle through them
        $output = "";
        foreach (explode("\n", $str) as $line)
        {
            // Is the line within the allowed character count?
            // If so we'll join it to the output and continue
            if (strlen($line) <= $charlim)
            {
                $output .= $line."\n";
                continue;
            }

            $temp = '';
            while ((strlen($line)) > $charlim)
            {
                // If the over-length word is a URL we won't wrap it
                if (preg_match("!\[url.+\]|://|wwww.!", $line))
                {
                    break;
                }

                // Trim the word down
                $temp .= substr($line, 0, $charlim-1);
                $line = substr($line, $charlim-1);
            }

            // If $temp contains data it means we had to split up an over-length
            // word into smaller chunks so we'll add it back to our current line
            if ($temp != '')
            {
                $output .= $temp."\n".$line;
            }
            else
            {
                $output .= $line;
            }

            $output .= "\n";
        }

        // Put our markers back
        if (count($unwrap) > 0)
        {
            foreach ($unwrap as $key => $val)
            {
                $output = str_replace("{{unwrapped".$key."}}", $val, $output);
            }
        }

        // Remove the unwrap tags
        $output = str_replace(array('{unwrap}', '{/unwrap}'), '', $output);

        return $output;
    }
}

// ------------------------------------------------------------------------

/**
 * Ellipsize String
 *
 * This function will strip tags from a string, split it at its max_length and ellipsize
 *
 * @param	string		string to ellipsize
 * @param	integer		max length of string
 * @param	mixed		int (1|0) or float, .5, .2, etc for position to split
 * @param	string		ellipsis ; Default '...'
 * @return	string		ellipsized string
 */
if ( ! function_exists('ellipsize'))
{
    function ellipsize($str, $max_length, $position = 1, $ellipsis = '&hellip;')
    {
        // Strip tags
        $str = trim(strip_tags($str));

        // Is the string long enough to ellipsize?
        if (strlen($str) <= $max_length)
        {
            return $str;
        }

        $beg = substr($str, 0, floor($max_length * $position));

        $position = ($position > 1) ? 1 : $position;

        if ($position === 1)
        {
            $end = substr($str, 0, -($max_length - strlen($beg)));
        }
        else
        {
            $end = substr($str, -($max_length - strlen($beg)));
        }

        return $beg.$ellipsis.$end;
    }
}


// ------------------------------------------------------------------------


/* End of file my_text_helper.php */
/* Location: ../app/admin/helpers/my_text_helper.php */